[TowerTalk] Any BN-86 Balun Replacement Suggestions?

[Eric - VE3GSI]

TT Gang,
 
It looks like my BN-86 Balun used on a TH7-DX beam is giving me grief. The
antenna was assembled to use the DX or lower portions of the bands. The SWR
measurements are good on 20 meters, but on 15 and 10 meters the SWR is 1.2:1
on the CW portion of the band. After doing some basic research and talking
with a friend we have come to the conclusion the Balun may be causing my SWR
problems. I am considering a new Balun for as a replacement from DX
Engineering. DXE have several models to choose from so I will have to wade
through the details, but several obvious questions come up. 
 
How do you mount these Baluns on a beam and is the ground strap still
required for beam mounting or does one 'float' the Balun electrical ground? 
 
Which DXE Balun model works best on the THY antenna?
 
Are there other Baluns I should consider for using with the TH7 antenna?
 
Thanks gang,
Eric - VE3GSI